I have Raritan electric heads that I installed a few years ago and they have worked flawlessly until this year. (especially great when there are none boaters on board) This year they splash a fair amount of water up in the air as you flush. Many times with so much volume that closing the lid does not stop the entire problem as you get some spray out the side as it hits the closed lid. My assumption was a blocked vent such that pressure was building up in the tank and forcing part of the flush water out as the values opened up while flushing; but cleaning the vent hasn't seemed to help...
Any ideas?
Any ideas?